Knauf 100mm DriTherm 37 Cavity Wall Insulation Slab Pack of 12 (6.55m²)
Knauf 100mm DriTherm 37 Cavity Wall Insulation Slab is a water-repellent glass mineral wool insulation designed specifically for external full-fill masonry cavity walls. With a declared thermal conductivity of 0.037 W/mK, DriTherm Cavity Slab 37 provides reliable thermal performance together with the flexible, close-fitting installation characteristics of mineral wool insulation.
Each pack contains 12 slabs measuring 1200x455x100mm and provides approximately 6.55m² of coverage. At 100mm thickness, the insulation provides a thermal resistance of 2.70m²K/W and achieves Euroclass A1 reaction-to-fire classification, meaning it is non-combustible.
The glass mineral wool slabs are designed to friction fit between wall ties and knit closely together, helping accommodate slight imperfections in masonry surfaces and minimise unintended gaps within the insulation layer.
Key Features & Benefits - Knauf 100mm DriTherm 37 Cavity Wall Insulation Slab
- Manufacturer: Knauf Insulation
- Range: DriTherm® Cavity Slab 37
- Product type: Cavity wall insulation slab
- Material: Glass Mineral Wool
- Thickness: 100mm
- Slab size: 1200x455x100mm
- Pack quantity: 12 slabs
- Coverage: approximately 6.55m² per pack
- Thermal conductivity: 0.037 W/mK
- Thermal resistance: 2.70m²K/W
- Reaction to fire: Euroclass A1 - non-combustible
- Application: External full-fill masonry cavity walls
- Water resistance: Manufactured with a water-repellent additive
- BBA Agrément: 95/3212
- Technology: ECOSE® Technology
- Manufacturer product code: 715831
- EAN / GTIN: 5056376642226
- Packs per pallet: 25
- Designed to friction fit between wall ties
- Flexible mineral wool adapts to slight imperfections in the masonry
- Closely fitting slabs help minimise gaps within the insulation layer
- Water-repellent glass mineral wool for cavity wall construction
100mm Cavity Wall Insulation
Knauf DriTherm Cavity Slab 37 is designed for suitable external masonry cavity walls where full-fill mineral wool insulation forms part of the specified wall construction.
The 100mm thickness is suitable where the cavity design has been specified around a 100mm insulation layer. The cavity should always be designed to accommodate the insulation thickness rather than compressing the slab into a narrower space.
Thermal Performance - 0.037 W/mK
DriTherm Cavity Slab 37 has a declared thermal conductivity of 0.037 W/mK.
At 100mm thickness, the product provides a thermal resistance of approximately 2.70m²K/W.
The final U-value achieved by the completed external wall will depend on the complete construction build-up, including the masonry leaves, block type, wall ties, finishes and other materials.
Designed for Full-Fill Masonry Cavity Walls
Knauf DriTherm Cavity Slab 37 is specifically designed as full-fill insulation for suitable external masonry cavity wall construction.
When correctly installed, the mineral wool forms a continuous insulation layer between the inner and outer masonry leaves, helping reduce heat loss through the external wall.
The correct insulation thickness should always be selected according to the cavity width, target thermal performance, exposure conditions and individual project specification.
Designed to Fit Between Wall Ties
Each DriTherm slab measures 455mm wide, allowing it to fit efficiently between standard vertical wall-tie spacings.
The mineral wool friction fits between the ties and allows adjacent slabs to be closely butted together.
Knauf states that this friction-fit installation means additional retaining discs or jointing tape are not required when the product is installed in accordance with its approved system.
Flexible Mineral Wool Helps Minimise Gaps
Glass mineral wool has the flexibility to adapt to slight imperfections in masonry surfaces and surrounding construction.
The fibres allow adjacent slabs to knit closely together, helping reduce unintended air gaps that could otherwise negatively affect the thermal performance of the insulation layer.
Water-Repellent Cavity Wall Insulation
Knauf DriTherm Cavity Slab 37 is manufactured with a water-repellent additive to help resist moisture ingress within approved cavity wall constructions.
The insulation should still be stored, handled and protected correctly during construction. Avoid installing damaged or heavily contaminated material and protect exposed insulation and unfinished masonry from adverse weather.
BBA Certified for Cavity Wall Applications
Knauf DriTherm Cavity Slabs hold BBA Agrément certification for use within suitable masonry cavity wall constructions.
Knauf states that the slabs are approved for use in all exposure zones, including very severe areas, when the construction and installation comply with the requirements of the relevant BBA certificate.
Building height, exposure, cavity width, masonry specification and all project-specific requirements should be checked before installation.
Ideal for New Builds & Extensions
Knauf 100mm DriTherm 37 is suitable for a wide range of masonry cavity wall projects where this thickness and thermal specification meet the design requirements.
Typical applications include:
- New-build houses
- House extensions
- External masonry cavity walls
- Residential developments
- Suitable non-domestic masonry construction
- Full-fill cavity wall insulation projects
Euroclass A1 Non-Combustible Insulation
Knauf DriTherm Cavity Slab 37 achieves a Euroclass A1 reaction-to-fire classification in accordance with EN 13501-1.
A1 is the highest Euroclass reaction-to-fire classification and means the glass mineral wool insulation is classified as non-combustible.
Pack of 12 - 6.55m² Coverage
Each pack contains 12 individual cavity insulation slabs, with each slab measuring 1200x455x100mm.
The complete pack provides approximately 6.55m² of insulation coverage.
When calculating the number of packs required, use the actual insulated wall area and allow appropriately for openings, detailing, cutting and project-specific wastage.
ECOSE® Technology
Knauf DriTherm Cavity Slab 37 is manufactured using ECOSE® Technology, Knauf Insulation's plant-based binder technology used within its glass mineral wool insulation range.
This technology gives Knauf glass mineral wool its distinctive natural brown appearance and forms part of the manufacturer's current mineral wool insulation system.
Durable Cavity Wall Insulation
DriTherm Cavity Slab 37 is designed to provide long-term thermal performance when correctly installed and protected within the masonry cavity wall construction.
The flexible glass mineral wool helps maintain a continuous insulation layer while adapting to slight irregularities within the surrounding masonry.
Installation Advice
Install DriTherm Cavity Slabs as the masonry wall is constructed, positioning the insulation closely between wall ties and tightly butting adjoining slabs together.
Avoid leaving unnecessary gaps and keep the cavity and insulation clear of excessive mortar droppings and other construction debris.
The 100mm slabs should not be excessively compressed into a cavity narrower than their specified thickness.
Protect exposed insulation and unfinished cavity walls from adverse weather and always follow Knauf Insulation's current installation instructions, BBA certification and the project specification.
Knauf DriTherm Cavity Slab Technical Datasheet
For full manufacturer technical information, available thicknesses, thermal performance, certification and installation guidance, refer to the official Knauf Insulation DriTherm Cavity Slabs technical datasheet:
View Knauf DriTherm Cavity Slabs Technical Datasheet
DriTherm 37 or DriTherm 32?
The main difference between DriTherm 37 and DriTherm 32 is thermal conductivity.
DriTherm 37 has a declared thermal conductivity of 0.037 W/mK, while DriTherm 32 has a lower thermal conductivity of 0.032 W/mK.
At 100mm thickness, DriTherm 37 provides a thermal resistance of approximately 2.70m²K/W, while the equivalent 100mm DriTherm 32 provides greater thermal resistance.
The appropriate DriTherm grade should be selected according to the required wall U-value, cavity width, project specification and budget rather than thickness alone.
Why Choose Knauf 100mm DriTherm 37 Cavity Wall Insulation Slab?
Knauf 100mm DriTherm 37 Cavity Wall Insulation Slab provides reliable full-fill thermal insulation for external masonry cavity walls. Its 0.037 W/mK thermal conductivity, 2.70m²K/W thermal resistance, water-repellent construction and Euroclass A1 non-combustible classification make it a practical choice for new-build, extension and other suitable cavity wall projects.
With 12 slabs per pack covering approximately 6.55m², the 100mm DriTherm 37 pack also provides substantially more coverage per pack than the equivalent 100mm DriTherm 32 product, making it useful where the DriTherm 37 thermal specification is sufficient for the wall design.
